The show band of 50 to 60 volunteers, whose ages range from teenage to those in their upper 80s, has been performing free concerts for the community for more than 30 years.

They hold a concert every month, except in August, at various locations in town while Chaffey High School’s historic Gardiner W. Spring Auditorium is under renovation. Many performances are held in the Ontario Town Square and at Hill Auditorium on the corner of Euclid Avenue and Fifth Street.

“I think it’s so wonderful that we put on these free shows, and we have quite a large following, that they’re able to come for free, get coffee and cookies, and enjoy an evening,” McAleer said.

The band’s concerts attract anywhere from 600 to 1,000 attendees, said Gabe Petrocelli, band director.

“We play a lot of popular music,” Petrocelli said. “I think that’s the key to our success is we play to our audience.”

The performance Monday will be the band’s second focused on doo-wop classics.

After the popularity of its first doo-wop show in April 2017, the band decided to do another one.

“A lot of the people out in the audience, they haven’t heard some of this stuff for many, many years,” said Bonner, longtime band member and former singer with The Bonner Family, who produced several country music albums in the ‘80s.

Bonner will sing lead vocals on “Happy, Happy Birthday Baby,” and “The Book of Love,” while McAleer will be the lead vocalist on “Good Night Sweetheart,” and “Since I Fell For You.”

The show band will perform instrumentals, “Come Go With Me,” and “This Magic Moment.”

Shy, nephew of jazz legend Duke Ellington and a former member of “The Coasters,” “The Drifters,” “The Checkmates,” and “Dewey and Don,” will perform “Hookin’ It Up,” “I’m Leaving It All Up To You/The Letter,” “Any Port In The Storm,” “Let It Be Me,” “Don’t You Know,” “Ruby,” and “L.O.V.E.”

“I know it will be a great show. Gabe is a great arranger,” said Shy, who has performed with the band a few times.

“These guys do this stuff because they enjoy it,” he said.

The band was founded in 1985 by the late Jack Mercer and a group of his former students from Chaffey High School, where he taught music for nearly 30 years.

When Mercer retired from the band in 2013, Petrocelli, who already had been working with the band, took over as director. He also writes all of the band’s arrangements.

The show band holds weekly practices from 7 to 9 p.m. Mondays in the band room on campus named in honor of Mercer, who died in 2014. He was 91.

“There was no one in the world like him, nobody,” McAleer said. “He had a way of making you feel, when he met you for the first time, like you were his long-lost sister or brother.”

The Doo Wop Spectacular II will start at 7:30 p.m. April 16 at the Ontario Town Square, 224 N Euclid Ave.